[SCSI] zfcp: Assign scheduled work to driver queue

The port_scan work was scheduled to the work_queue provided by the
kernel. This resulted on SMP systems to a likely situation that more
than one scan_work were processed in parallel. This is not required
and openes the possibility of race conditions between the removal of
invalid ports and the enqueue of just scanned ports.  This patch
synchronizes the scan_work tasks by scheduling them to adapter local
work_queue.

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 9 insertions, 16 deletions

diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
index 9252b65a13a5..7d6b3cadfb73 100644
--- a/drivers/s390/scsi/zfcp_fc.c
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -184,7 +184,7 @@ static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
                 range_mask = rscn_range_mask[fcp_rscn_element->addr_format];
                 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
         }
-        schedule_work(&fsf_req->adapter->scan_work);
+        queue_work(fsf_req->adapter->work_queue, &fsf_req->adapter->scan_work);
 }
 
 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
@@ -664,10 +664,12 @@ static int zfcp_fc_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft, int max_entries)
 
 /**
  * zfcp_fc_scan_ports - scan remote ports and attach new ports
- * @adapter: pointer to struct zfcp_adapter
+ * @work: reference to scheduled work
  */
-int zfcp_fc_scan_ports(struct zfcp_adapter *adapter)
+void zfcp_fc_scan_ports(struct work_struct *work)
 {
+        struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
+                                                    scan_work);
         int ret, i;
         struct zfcp_gpn_ft *gpn_ft;
         int chain, max_entries, buf_num, max_bytes;
@@ -679,17 +681,14 @@ int zfcp_fc_scan_ports(struct zfcp_adapter *adapter)
 
         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
-                return 0;
+                return;
 
-        ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
-        if (ret)
-                return ret;
+        if (zfcp_fc_wka_port_get(&adapter->gs->ds))
+                return;
 
         gpn_ft = zfcp_alloc_sg_env(buf_num);
-        if (!gpn_ft) {
-                ret = -ENOMEM;
+        if (!gpn_ft)
                 goto out;
-        }
 
         for (i = 0; i < 3; i++) {
                 ret = zfcp_fc_send_gpn_ft(gpn_ft, adapter, max_bytes);
@@ -704,15 +703,9 @@ int zfcp_fc_scan_ports(struct zfcp_adapter *adapter)
         zfcp_free_sg_env(gpn_ft, buf_num);
 out:
         zfcp_fc_wka_port_put(&adapter->gs->ds);
-        return ret;
 }
 
 
-void _zfcp_fc_scan_ports_later(struct work_struct *work)
-{
-        zfcp_fc_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
-}
-
 struct zfcp_els_fc_job {
         struct zfcp_send_els els;
         struct fc_bsg_job *job;